Material cutting device



Jan. 12, 1954 B. w. BLACKMAN 2,666,123

MATERIAL CUTTING DEVICE Filed Dec. 15, 1951 3 Sheets-Sheet l i INVENTOR.

' BERTRAM W. BLACKMAN 1954 B. w. BLACZKMAN MATERIAL CUTTING Davie I5 Sheets-Sheet 3 Filed Dec 15, 1951 INVENTOR. BERTRAM W. BLACKMAN BY 5 mama Patented Jan. 12, 19 54 UNITED" STATES PATENT" OFFICE 21566423 I MATERIAL CUTTINGTJDEVICEV Bertram..W'.B1ackman, Great Neck, N; Y;

ApplicationDecember 13, 1951;: smarrmzsnsse 9 .0laims.-- (Cl. 219-19)? 1- This invention relates to a material cutting device.

More specifically; the 'present "invention pro-=- poses the construction of:fa"=materia'lcutting' de:

vice having heated pattern :forms for searing-x its way through layers of material stacked ron are slidablysupported for movement toward and away from the top of the table'and uponwhich theheatecl :pattern formszrare mounted to sear their way through: the layers: of: material as the heads are lowered;

Another :object of the present invention PTO-r pose's'a novel 'meanszfor removably mounting the pattern forms onthe' bottom faceseoii the movable heads in a manner so that the iormsin: use can;

be removed" and interchanged with others which 25 are to be used without:requiringetheuse of any tools to makeithe change.

As a further objectythe present invention'prm poses using verticatmounting posts providedat" their bottom" vendsrwith resilient gripping-tips for engagement with ithe-ipatterntforms -and which areconstructed. at their: top; ends to be removablvinsertedrinto complementary socket opens ings: formeol in 1 thexbottom faces .ofiqthe': movable heads; in' a manner to supportthe pattern *forms:

on the heads.

the top ends 'of the posts whichmake'iel'ectrical contact with similar contactsmounted within the movable heads in a mannerrto supply there quired current to energize the heaters to'..heat

the pattern forms to the required temperature:

to sear their way throughthelayers of "material when the heads areloweredw engaged in the mass productien' of=articles made from*-cloth materials 'as the devi-c'e requires a minimum of time-to se'tup" and onceset" ef'- up the'mass production'ofithetcloth arti es:

It'is a further object of tl'ie *presentfifnventfon' to construct a material cutting device of the classrdescribed ,which is simple and durable;

which :is I effective for its intended pu-rposes and which can be manufactured and-sold at a rea-- s'onable costs Onthe accompanyingdrawings forming amaterialepartof thepresent disclosure:

Fig-- 1 is a s-iront elevational view of' the materialcutting device constructed in accordance with the present invention;

Fig. '2 is an end'elevational view looking 'fromview-of the tables per se, taken' on the line 55 Fig. 6'i's airienlargect bottom elevationalview of 0119 01 zthfizhGfidSfllOOkiH-E in thedirection of the line 66-"ofi Fig-. 1;

Eig1.=.-7 isa-an enlarged-- detailedsectional view of: a; portion-of onei-of the -heads.

Fig. 8 is-anwerrlargecr partial vertical sectional view -xthroughoneor the mounting posts taken on-athe' line 8 8 otiFig. '7'.

Fig--.- 9 isa horizontal sectional view: taken on thcf-linefi-" il otFig. 8-.-

Fig-.- 10--is =aperspective view ofone of the mounting; posts-,- per se Figal l is-a-perspectiveview of one of the pat tern" forms; per-"see- Fig; 12iisea-viewsimilartoFig. 8; but illustratingiithe-pattern form constructed in accordance Still'another object of thepresent'iinvention:

proposes the inclusions ofvelectricheaters within: the mounting posts and :connected to contacts on with a 'mcdificationrof the present invention.

Fig. 13 18238;!peISpBCtiVS"ViBW? of a portion" of the-iipatterrrrform usedin'vthe form: of the' in vent'ion shown a in Fig-.: 1 2'.

Fig; l4 isarr-zenla'rged' perspective view of the wire? used' in the pattern fo'rmshown in Fig.- 13'."i

'Ihecuttings device; according to the first form of the presentcinventionshown in Figs. 1 to ll'xincludesaznarrow elongated-table is having:

a flat top 2| supportedjiir anelevate'cl position on'zrsuitablevl'egsi 22 .1; Cloth material 'zt'tohe cut accordance with 'certain' I preformed pattern shapesyisviaid up in superimposed layers on th-e -"tahlertop e'2'il' adjacent the front; edge thereof as; shown in Figsz' l and 2'2 The front portion of; thetable top 21 upon: which the layers of cloth materiab 23 are laidfis covered by a-sheet of re-" fracto'ry material "Z4" capable of protecting the tame-to from burningwhen the layers of material 23 have been completely seared through as will become clear as this specification procee-ds. The sheet of refractory material is preferably a thin sheet of asbestos held in position lareed foot portions 21 bolted to the table top 2| beyond the rear edge of the sheet of refractory mate ial, see Fig, 2. At their top ends, the brackets 2e continue into forwardly extending arm formations 28 which overhang thesheet of refractory material 24 and the layers of cloth material 23 stacked thereon. The right angle juncture of the main body of the brackets 26 and the arm formations 28 are reinforced by braces 23.

Secured to the free end of each of the arm formatinns 23, there is a vertically extended cylinder an supporting a piston rod 3| for vertical slidin movement. The bottom ends of the piston rods 3| are extended from the bottom ends of the cylinders 39 and having heads 32 mounted thereon. Mounted on the top ends of the piston rods 3| within the cylinders there are pis tons 33. The pi ton 33 are secured in position by several bolts 34. The cylinders 30, the piston rods 3| and the pistons are souare in crosssection. as can be best determined from Fig. 4, so that the hea s cannot turn relative to the cylinders 35 while at the same time having freedom of vert cal sliding movement relative thereto.

The top ends of the cylinders 3|] are open excent for cans which are fitted into the open t ns and held in position by removable screws 36.

The en agement of the caps 35 with the top ends of the cylinders 3|) is sealed by compressible askets 31 of rubber or like material.

Enc rcling the piston rod 3| within the cylinder there is an expansion spring 38. The spring 33 operates between the bottom end of the cylinder 30 and the bottom face of the respective piston 33 maintaining the piston rod and the respective head 32 in the raised position shown in Figs. 1 to 3. Downward movements of the heads 32 are controlled by fluid under pressure introduced through an externally threaded nipple 39, see Fig. 3, formed on the rear side of each of the cylinders 3|! above the arm formations 28. One end of a flexible tube 40 is connected to each of the nipples 39 by a union 4|. The other ends of the tubes ll! are connected to a manually controllable source of fluid under pressure not shown. for at will feeding fluid under pressure into the top of any one of the cylinders 3|]. The fluid under pressure will act against the top face of the pistons 33 and lower the heads 32 against the action of the expansion springs 38. Whenthe' fluid under pressure is released the springs 38 will function to raise the piston rods 3| and attached heads 32 causing the fluid to flow out of the nipples 35 and back to the source.

Each of the heads 32 is alike in construction and each has a hollow casing 42 of metal or similar material which is open at its bottom. The top of each casing 42 is formed with an upstanding boss 43 formed with an upwardly opening recess id into which the bottom end of the respective piston rod 3| is received. The boss 43 and the respective piston rod 3| are removably joined together by an elongated pin 45 passed '4 through aligned holes formed in the parts, as best shown in Fig. 3.

Snugly fitted into the open bottom of each of the casings 42 and against an internal shoulder 45 formed within the casings, there are plates 41 of insulation material capable of withstanding heat. The plates 41 are molded of any desired material capable of withstanding the heat generated by the device and good results have been obtained from the ceramic materials as porcelain. The plates 4'! are removably secured in position by screws 48, see Figs. 6 and '7, passed in from the sides of the casings 4| and threaded into the material of the plates.

Provided for mounting on each of the heads 32, there is one or more pattern forms 49. As best shown in Fig. 11, the pattern forms 49 are formed as a continuous outline being bent from an elongated strip of flat metal Wire which can be safely heated to a high temperature to have a searing eifect on the layers of cloth material 23 laid up on the table top 2|. the strip of material used forforming the pattern form 49 are joined together by welding or the like to maintain the smooth continuity of the pattern form.

The pattern forms 49 are supported on the bottom face of the heads 32 by means of removable mounting posts 59, which have their top ends fitted into selected socket openings 5| formed in the bottom faces of the plates 4'! of the heads 32. Molded into the material of the plates 41 concentric with the axis of the socket openings 5|, there is a cap contact 52 and a ring contact 53 for each of the socket openings. The contacts 52 and 53 are arranged one above the other on the axes of the socket openings 5| and are formed of a conductive material. The cap contact 52 is open at its bottom and formed with a concentric depending headed post 54 for a purpose which will become clear as this description proceeds.

Extended upward from the cap contacts 52 there are extensions 55 exposed beyond the top face of the plate 41. Likewise, the ring contacts 53 have extensions 55 extended upward beyond the top face of the plate 41. The extensions 55 and 53 are connected by leads 5! and 58, respectively, in parallel to main leads 59 and 50, see particularly Fig. 7. The ends of the main loads 59 and 60 are extended from the casings 42 of the heads 32 and provided With the usual plugs 6| for insertion into the usual outlet receptacles for supplying the required electric current for the cutting device. From Fig. 7, it is apparent that the pairs of contacts 52 and 53 are connected in parallel with the leads 59 and 60 so that each pair of contacts may operate independently of the other pairs.

The interiors of the contact rings 53 are tapered to have their greatest dimension at their bottom ends, as best shown in Fig. 8.

The mounting posts 55 are all alike in formation and each includes a main body portion 62 formed of a dielectric, refractory materialporcelain or the like. Molded into position on the bottom end of each of the main body portions 62 there is a gripping tip 63 formed of a metal which readily heats to a high temperature. Extending upward from each of the gripping tips 63 there is a rod 54. The rods 64 are formed integrally with the gripping tips 63 and are extended concentrically through the main body portions 62 nearly to the top ends thereof, for both reinforcing the main body portions 62 and for conducting heat to the gripping tips 63. Ex-

The adjacent ends 49* of tended :inward 5. fromi the bottom: ends: t 1 thee? grippingitips 63 there; ar.e;slots '6 icgfor :receiving the :pattern; .forms: @19 1. The slots; 64;. divide; the. bottom= .endi portions Ofi'thB gripping: tips into I spaced-q tines {iii i'which are: converged downward 5 1 andisinwardg see.-Fig. 8; The arrangement: of the. tines fitvrequires that the: pattern formsto; beiorced-into positionabetween the tines 65 so that the tips 63C-Wi1lf irictionallygrip and niain- I, tain the patternzforms 49- in position.

Molded-= into the material of-"themain body portions- 62*" of the mounting posts 58 -tosurround the-:- rods 64 I without touching-the same, there are resistance windings 01 heater coils cl; The coils-S'Fareinsulated electrically from the rods--64 by thematerial of'the main hody portions 62; however, the close proximity of the" heater-coilsto the rodsiitwill cause those rods; to conduct the heat-tothe gripper-tipsand thence to the pattern; forms- 39 supported bY' the mounting posts 59.

The topend portions ;of the mounting-posts Eaaretapered conforming to the-taperof thev interiors of-thecon-ductorirings 5'3: Ioldedinto the tapered top. end portions of the mounting; 255

posts 58; there are headcontacts 68 and ring contacts 69.- The contacts 58 and 69" are made of a conductive metaland'when. the tapered; top endporticns ofi'the mounting posts 5c; are inserted. fully. into the socket openings. 51!, the headcontacts, temake electrical contact. with the cap contacts 5.21jand the. ring contacts make electricaljcontact. with the ring contacts. 53,' see Fig. 8.. The-outer peripheriesof thering. contacts. 69. are taperedtohave asnug fit the pered. inner formations, of the ring contacts 53...

Means is provided. fort, releasably joining the head contacts; 53,. to. the/cap contactsfii. to. es. leasably maintainthe mounting. posts. 5%, in ,po sition within. thesocket openings 5i. while at the same. time permitting, free. turning ,of...the-. mounting posts 59 on their. vertical: axes. to. properly locate the slotstfi, in theibottomends of. the posts forengagement with: the: pattern forms 49. The releasable mounting, isiaccon. i plished-by forming the topends of: the headcone tacts 53-;with sockets 'l 9 1 conformed tfyti'lfi shape; of the, headed posts: lcoi the capcontactsfiih Extended inward from the tcp-.- ends ofutheheadv contacts, t8-thereare-slots ll see Figs. 8i--an,d:;so 10, which render thetoo ends of ;the.- headxcom tacts; $53 7 sufilciently resilient: to spread as-the; headedpost-s 5 i" are" forcedrintopr pulled out, of; the sockets Whenthe headedjpostsrl are: iii-position inthe sockets 76;. as. shown in; l' 8, it is appreciated: that the mounting posts: have freedom of'rotativemovement-on their .VEIY- tical'axes without in any way interferingwith: the electrical engagement. oftthepairs officertacts 52; andiia-andiii andES:

One end. of: the heating. coi1-:fil1 is secured-to. the'h'eadicontact' 56'. and the other endiis cone nectedtothering contact fis iseeiF'ig; 8

For purposes of clarity of illustration: on the drawing, the'nurnoer of'sochet-openings: Eiion the bottomface or theheads fi-i has been reduced in number. In actual practicethenumber: of socket openings will be increased with the socket openings being'spaced from each other-- about one inchor one and :one-half inches in all di- 70 rections.

The operation of the cutting deviceof the present invention is as follows The desired numher --of-layers-of =the cloth ma.-.- terial 23 are first laid uponthe tabletop- 2-I"-be--- neat-h-atheheads-Brand the desired pattermforms, 491:236 selected. Theselected pattern fQrmsAQ; are mountedcon; :the heads 32 using. a mounting pest :Eiluwherever :portions of. the pattern forms $9 I pass heneath" the. socket. openings, 5! ofthe After: the; pattern forms-:49 are ;mounted in: position,--the plugs 61 are inserted ,intothe out let receptacles to supplytheeiectric current requiredto energize the heater coils 6'5 of the mountingposts -5D A period of time is permitted to elapSe-pf sufiicient duration to thoroughly heat the pattern forms 29 to a tempera ture to-searthe cloth material. When the patcloth material to the elesired outlines. ward movement ofthe heads 32 will be arrested by engagement ofthe pattern forms is'i'with-thesheet of refractory material Eiwhich covers and protects the table top 21 against damage from the hot pattern forms; After the heads have been completely lowered, the supply of fluid-to thacylinders 39is out ofi'jallowing the-springs 38 to raise/the heads 32 to their starting positions withdrawing the pattern" forms 39 from thelayers,o-fjclothjmaterial. It is appreciated,- of course, that'themounting posts 56 mustbe made sufiiciently long. to permit the pattern formsoa to pass. completely through the layersof cloth material,izsbeforevthe heads engage the: topmost layer. of the stacla of cloth material.

The modification of the, invention shown in Figs. 12 to lillustrates a modifiedconstruction of therpatternform for use with the cutting device; The-modified pattern form 49f is of two part construction consisting of amairrbody portion 49 anda, searing portionASP. The searing portion .49! isbent from an elongated piece of metal :wire. capable of being heated to a high temperature-and has its. adjacentends Welded together. The metal wire used for forming the sear-ingportiontQP, is shaped to include upstandingzrib. A99. of virregular formation, as best shown in Fig; 14. After thesearing portion ie? has been. bentto. shape, themainhody portion 49* is molded inv position on the upstanding rib; 49 of. a: refractory material capable of with: standing high temperatures so that the major. part of vtheipattern form 49' remainsv cool when in. operation,

Theimain loody.portiontl oi the patternform 49"" has arthickness less than, the diameter of thesearing.portionsi3 so that the sides of they searing-portionproject beyond the sides ofv the main, body portion. However, the main body portion warhas =a thicknessto. he. frictionally received within the slot $5 of the gripping tip G3 of'the mounting posts 553 as shown. in Fig. 12.

Thesheightof themain body, portion i9 issuch.

that when the pattern form 1-391 is fully inserted intorthe grippingtip 53, the tip ends of, thetines 65 will zcontacththe sides or" the searing portion 49 and conduct-the heat thereto from the heater coil 6];to;hea t the searing portion lii to sear its ay; thrqughvthestacked l yers of oloth mat i 23-:whentheheaos3Zar JcWere ll: other-respec s: he; form fy heiinvenrtion-shown: in Figs; 12,;to 11 i is similar 'COJ'thflliTdir scribed in connection with Figs. 1 to 1-1 and like. reference-numerals are used toidentify like parts,-

From-the foregoing description, it is apparent that the present invention proposes a novel arrangement of cutting device for cutting cloth layers to the desired pattern outlines by searing through the material. The chief advantage arising from the use of the present device is the great speed with which a great number of forms can be cut out so as to materially speed up the mass production of articles of clothing and other similar articles made of cloth material. forms 49 are completely interchangeable with a minimum of effort and at a great saving in time as no tools are required for making the interchange.

While I have illustrated and described the preferred embodiments of my invention, it is to be understood that I do not limit myself to the precise constructions herein disclosed and the right is reserved to all changes and modifications coming within the scope of the invention as set forth in the appended claims.

Having thus described my invention, what I claim as new and desire to secure by United States Letters Patent is:

l. A material cutting device, comprising a table adapted to have layers of material to be cut to conform to certain pattern outlines laid up thereon, a support bracket mounted on said table and having an arm formation disposed to overhang the material laid up on said table, a head slidably supported on said arm formation for movement toward and away from said table, means for lowering said head toward said table, a metallic pattern form, means removably supporting said pattern form on the bottom face of said head to move therewith, and means for heating said pattern form to sear through the layers of material laid up on said table when said head is lowered toward said table, said table having a table top upon which the layers of material are to be laid up, and a sheet of refractive material covering said table top beneath the laid up layers of cloth material, said head having a hollow casing having an open bottom, and a plate closing the open bottom of said hollow casing and from which said pattern form is supported, said removable supporting means comprising vertically elongated mounting posts, each of said mounting posts having a main elongated body portion, said plate having socket openings into which the top ends of the main elongated body portions can be selectively engaged, and gripping tips mounted on the bottom ends of said body portions for mounting said pattern forms, said heating means comprising a heating coil molded into the material of said main body portion, said spaced contacts molded into the material of the top end of said main body portion and connected to the ends of said coil, spaced contacts molded into said plate coaxially with each of said socket openings for contacting said first contacts when said mounting posts are inserted at their top ends into said socket openings.

2. A material cutting device, comprising a table adapted to have layers of material to be cut to conform to certain pattern outlines laid up thereon, a sup-port bracket mounted on said table and having an arm formation disposed to overhang the material laid up on said table, a head slidably supported on said arm formation for movement toward and away from said table, means for lowering said head toward said table, a metallic pattern form, means removably supporting said pattern form on the bottom face of said head to move therewith, and means for heating said pattern form to sear through the layers of material laid up on said table when said head The pattern is lowered toward said table, said table having a table top upon which the layers of material are to be laid up, and a sheet of refractive material covering said table top beneath the laid up layers of cloth material, said head having a hollow casing having an open bottom, and a plate closing the open bottom of said hollow casing and from which said pattern form is supported, said removable supporting means comprising vertically elongated mounting posts, each of said mounting posts having a main elongated body portion, said plate having socket openings into which the top ends of the main elongated body portions can be selectively engaged, and gripping tips mounted on the bottom ends of said body portions for mounting said pattern forms, said heating means comprising a heating coil molded into the material of said main body portion, said spaced contacts molded into the material of the top end of said main body portion and connected to the ends of said coil, spaced contacts molded into said plate coaxially with each of said socket openings for contacting said first contacts when said mounting posts are inserted at their top' ends into said socket openings, said spaced contacts of said socket openings being connected together in parallel for connection to a source of electric current.

3. A material cutting device, comprising a table adapted to have layers of material to be cut to conform to certain pattern outlines laid up thereon, a support bracket mounted on said table and having an arm formation disposed to overhang the material laid up on said table, a head slidably supported on saidarm formation for movement toward and away from said table, means for lowering said head toward said table, a metallic pattern form, means removably supporting said pattern form on the bottom face of said head to move therewith, and means for heating said pattern form to sear through the layers of material laid up on said table when said head is lowered toward said table, said table having a table top upon which the layers of material are to be laid up, and a sheet of refractive material covering said table top beneath the laid up layers of cloth material, said head having a hollow casing having an open bottom, and a plate closing the open bottom of said hollow casing and from which said pattern form is supported, said removable supporting means comprising vertically elongated mounting posts, each of said mounting posts having a main elongated body portion, said plate having socket openings into which the top ends of the main elongated body portions can be selectively engaged, and gripping tips mounted on the bottom ends of said body portions for mounting said pattern forms, said heating means comprising a heating coil molded into the material of said main body portion, said spaced contacts molded into the material of the top end of said main body portion and connected to the ends of said coil, spaced contacts molded into said plate coaxially with each of said socket openings for contacting said first contacts when said mounting posts are inserted at their top ends into said socket openings, one of said contacts of said first-mentioned spaced contacts being a head contact on said mounting post, one of said contacts of said second-mentionad spaced contacts being a cap contact opening downward to receive said head contact, and means releasably joining said head contact to said cap contact to retain the top end portion of said mounting post in position in said socket opening while leaving it free for rotation on its axis.

assette-e 4. A material cutting device; comprising a table adapted to-havelayers of material to be cut to :conform to certain pattern outlines laid up-thereon, a support bracket mountedon saidtable-and havingan arm formation disposed- 1:0 overhang the material laidup on-said table, a-head slidably supported on said arm formationrfor movement toward and away fromsa'idtable;meansfor lowering said head toward said table, a metallic pattern form, means removably supporting said pattern.

form on the bottom face of said head to move therewith, and means for heating said-pattern form to sear through the layers of'material laid up on said table when saidlhead is lowered toward said table, said table'having a table tops upon which the layers ofmaterial arelto'beflaid up, and a sheet of 'refractive' materiali' covering 3 said table top beneatlrthe 'laid'up layers ofcloth material, saidhead having a hollow ca'sin'g'hav- .ing an open bottom, and a'plate 'closingtheopen, bottom of said "hollow casing and from "which said pattern form is supported, said removable supporting means comprising vertically elongated mounting posts, each of said mounting posts having a main elongated body portion, said plate having socket openings into which the top ends of the main elongated body portions can be selectively engaged, and gripping tips mounted on the bottom ends of said body portions for mounting said pattern forms, said heating means comprising a heating coil molded into the material of said main body portion, said spaced contacts molded into the material of the top end of said main body portion and connected to the ends of said coil, spaced contacts molded into said plate coaxially with each of said socket openings for contacting said first contacts when said mounting posts are inserted at their top ends into said socket openings, one of said contacts of said first-mentioned spaced contacts being a head contact on said mounting post, one of said contacts of said second-mentioned spaced contacts being a cap contact opening downward to receive said head contact, and means releasably joining said head contact to said cap contact to retain the top end portion of said mounting post in position in said socket opening While leaving it free for rotation on its axis, and joining means comprising a headed post depended from said cap contact concentric therewith, and a complementary socket formed in the top end of said head contact for receiving said headed post.

5. A material cutting device, comprising a table adapted to have layers of material to be cut to conform to certain pattern outlines laid up thereon, a support bracket mounted on said table and having an arm formation disposed to overhang the material laid up on said table, a head slidably supported on said arm formation for movement toward and away from said table, means for lowering said head toward said table, a metallic pattern form, means removably supporting said pattern form on the bottom face of said head to move therewith, and means for heating said pattern form to sear through the layers of material laid up on said table when said head is lowered toward said table, said table having a table top upon which the layers of material are to be laid up, and a sheet of refractive material, covering said table top beneath the laid up layers of cloth material, said head having a hollow casing having an open bottom, and a plate closing the open bottom of said hollow casing and from which said pattern form is supported, said removable supporting means comprising vertically elongated mounting posts, each ofsaid mounting-posts ha'Ving -a malnelongated body portion, said l'plate having socket: openings into which the top-ends of the main elongated body portions scan? be selectively "engaged, and

tgrippingtips' mounted on thebottom ends of said body portions; for mounting :said pattern forms,

said heating rmeans comprising a heating coil lIlOld'Gdiil'ltO the materialbf said main body por- .-tion,-said spaced' -contacts moldedlinto the ma- :terial of the atop .end --of said i main body 1 portion each of said socket openings for contacting said serted ,attheirtop endsinto said -socket openmounting post, one of said contacts-of said second-mentioned spaced contacts being a cap contact'openmg downward toreceive 823101183181 contact, and means releasably Joining said head contact to said cap contact-to retain the -top end portion of said mounting post in position in sale! socket opening while leaving it rree lor rotation on its axls, said joining means comprising a heaoed post depended from said cap contact concentric therewith, and a complementary socket formed in the top end or said head contact for recelvlng said headed post, said head contact having slots extended in lrorn its Iree end and spaced about said socket so that said headed post can be inserted into and withdrawn Irom said socket.

6. A material cutting device, comprising a table adapted to have layers or material to be out to conform to certain pattern outlines laid up thereon, a support bracket mounted 011 said table and having an arm formation disposed to overhang the material laid up on said table, a head slidably supported on said arm formation for movement toward and away Irom said table, means for lowering said head toward said table, a metallic pattern form, means removably supporting said pattern form on the bottom face of said head to move therewith, and means I01 heating said pattern iorm to sear through the layers of material laid up on said table when said head is lowered toward said table, said table having a table top upon wnlcn the layers or material are to be laid up, and a sheet of refractive material covering said table top beneath the laid up layers or cloth material, said head having a hollow casing having an open bottom, and a plate closing the open bottom of said hollow casing and irom which said pattern form is supported, said removable supporting means comprising vertically elongated mounting posts, each or said mounting posts having a main elongated body portion, said plate having SOCliEl] openings into which the top ends of tne main elongated body portions can be selectively engaged, and grip-ping tips mounted on the bottom ends of said body portions for mounting said pattern forms, said heating means comprising a heating coil molded into the material of said main body portion, said spaced contacts molded into the material of the top end of said main body portion and connected to the ends or coil, spaced contacts molded into said plate coaxially with each of said socket openings i'cr contacting said first contacts when said mounting posts are inserted at their top ends into said socket openings, and a rod extended from said gripping tip and projected concentrically upward through said heating coil for reinforcing said body portion and for conducting heat to said pattern form.

'7. In a material cutting device including a table for material, and a support bracket including a slidable head and pattern form; said head including insulated plates, a mounting post secured in said plates, contact means in vertical spaced relation in said plates and extending upwardly therefrom to main lead means for independent operation, resistance windings in said posts to conduct heat to the pattern forms, and gripper means on said post to engage said pattern form, said contact means are cap contacts received within said plates and ring contacts engaging said post.

8. The combination of claim '7 wherein a head contact electrically contacts the cap member and a second ring contact engages said first ring member, and means to releasably join said head and cap contacts.

9. In a material cutting device including a table for material, and a support bracket including a slidable head and pattern form; said head including insulated plates, a mounting post secured 12 in said plates, contact means in vertical spaced relation in said plates and extending upwardly therefrom to main lead means for independent operation, resistance windings in said posts to conduct heat to the pattern forms, and gripper means on said post to engage said pattern form, the pattern includes a beaded portion extending beyond the gripper means.

BERTRAM w. BLACKMAN.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 588,940 Angell Aug. 31, 1897 685,833 Grall Nov. 5, 1901 1,447,730 Post Mar. 6, 1923 1,992,250 Stacey Feb. 26, 1935 2,552,353 'Iroth et a1 May 8, 1951 2,561,050 Charron et al July 1'7, 1951 2,569,807 Elstad Oct. 2, 1951 

